Tennis ball retriever



FIG. 1 is a perspective view of the front of a tennis ball retriever showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is an end elevational view thereof;

FIG. 5 is a front elevational view thereof; and

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a tennis ball retriever, substantially as shown and described. 